Title

FGH95粉末盤材料熱/機械疲勞和等溫低周疲勞斷裂行為研究

Translated Titles

Thermal-Mechanical Fatigue and Isothermal Low Cycle Fatigue Fracture Behavior of Powder Metallurgy Superalloy FGH95

Authors

張國棟(Guo-Dong Zhang);劉紹倫(Shao-Lun Liu);何玉懷(Yu-Huai He);汪武祥(Wu-Xiang Wang);鍾斌(Bin Zhong)

Key Words

航空、航天推進系統 ; 同相位 ; 熱-機械疲勞 ; 蠕變 ; 氧化 ; 循環應力 ; aerospace propulsion system ; in-phase ; thermal-mechanical fatigue ; creep ; oxidation ; cyclic stress

PublicationName

航空動力學報

Volume or Term/Year and Month of Publication

20卷1期(2005 / 02 / 01)

Page #

73 - 77

Content Language

簡體中文

Chinese Abstract

對粉末冶金盤材料FGH95進行了同相位,溫度循環為350℃到600℃的熱/機械疲勞試驗和600℃的等溫低周疲勞試驗。考察了兩種載荷波形下材料的循環應力響應行為和高溫疲勞斷裂機理以及載荷波形對疲勞壽命的影響。研究結果表明:同相位熱/機械疲勞壽命比上限溫度的等溫低周疲勞壽命短。該材料在高溫應變疲勞的循環應力響應行為與應變水平的大小以及循環載荷波形有關。試樣的微觀斷口分析顯示了在高溫應變疲勞試驗中同時存在疲勞、蠕變和氧化損傷。在同相位熱/機械疲勞載荷下,穿晶+沿晶斷裂為疲勞斷裂的主要特徵;在等溫低周疲勞載荷下,裂紋主要為穿晶萌生與擴展。

English Abstract

High temperature low cycle fatigue behavior of Powder Metallurgy superalloy FGH95 was studied. A basic triangular cycle with a constant temperature of 600℃ and an in- phase triangular cycle with maximum and minimum temperature of 350℃ and 600℃ respectively were used for thermal-mechanical fatigue testing. The strain ratio of minimum to maximum strain is -1.0. The influence of the above two loading cycle on cyclic stress response behavior, mechanism of fracture at high temperature and fatigue life was investigated. At same strain amplitude, it was found that the TMF life of in-phase loading form is shorter than that of isothermal low cycle fatigue loading form. High temperature low cycle fatigue behavior of PM superalloy FGH95 depends not only on loading form, but also on magnitude of stain. The microstructure damage behavior of high temperature low cycle fatigue is discussed. The results show that fatigue, creep and oxidation damage always develops simultaneously during low cycle fatigue at high temperature. Fracture is mainly intergranular and transgranular under inphase thermal-mechanical fatigue. The path of crack initiation and growth is transgranular under conditions of isothermal low cycle fatigue.

Topic Category 工程學 > 交通運輸工程